John frodsom and andrew mclinden



(No Model.)

J. FRODSOM 8v A. MGLINDBN.

AIR FEBDING DEVIGE.

No. 417,913. Patented Deo. 24, 1889.

UNITED STATES PATENT OFFICE.

JOHN FRODSOM AND ANDREV MOLINDEN, OF MARYPORT, COUNTY OF CUllIBERLAND, ENGLAND.4

yAIR-l-Elinllue DEVICE.

SPECIFICATION forming part of Letters Patent No. 417,913, dated December 24, 1889; Application tiled Jiine l0, 1889. Serial No. 313,727. (No model.) Yatented in England August 13, 1888, No, 11,631.

To all wiz/0m it mag/concern:

Be it known that we, JOHN FRODSOM and ANDREW MCLINDEN, residing at Maryport, inthe county ot' Cumberland, England, have invented certain new and useful Improvements in Devices for Admitting Air to Furnaces, (for which We have obtained a patent in England, No. 11,631, dated August 13, 1888,) of which the following is a specification.

This invention relates to heating and distributing a supply of air in the combustionchamber of a furnace; and itconsists in the novel combination of partsyhereinafter fully described and claimed, whereby the combustion in said chamber is rendered more per fect.

In the drawings, Figure l is a longitudinal section through the apparatus, showing portions of the combustion-chamber. Fig. 2 is a plan view of the apparatus from above, alsoV showing portions of the combustionchamber.

A is the combustion-chamber, which may be of any approved form. rlhis chamber is filled with burning gas, the heat of which may be applied to heating Water contained in a boiler or air contained in pipes or flues, as required for blast-furnaces. The inflammable gas is introduced into the chamber in any approved manner, and may be supplied with air to support combustion at various points, or air may be blown into the chamber through one or more pipes connected to the hot-blast pipes. As these parts are all of ordinary construction, and as they do not form an essential part of the present invention, although used in conjunction with it, they are not shown in the drawings. An inlet-pipe a is provided with a regulatingvalve a outside the combustion-chamber, and to the pipe a is connected the cold-air pipe b, which is placed inside the furnace or in the furnace-Wall in such position as not to be subjected to any very great heat. The air enters through pipe a and passes through pipe b into4 the receiving-chamber c. A series of pipes cl connect the chamber c with the distributing-chamber e, and these pipes d are arranged in the combustion-chamber, so that they are subjected to considerable heat. The chamber c is provided with a series of perforations e upon one side of the point of connection with it of the said pipes d, and f is a cold-air-inlet pipe connected directly with the chamber e upon the other side of the point of connection of the pipes d. A valve f serves to regulate the inlet of may be used; the greater the number and length of pipes d the more nely Will the air be divided up and the hotter it will `become before issuing into the combustionchamber. The heated air passes out of the perforations e in finely-divided streams into parts of the furnace Where air is usually lacking, and it thus insures a lnuch more perfect combustion of the whole body of the gas in the combustion-chamber. Vhen the air issuing through perforations e is too hot, the valve f may be opened slightly to permit some cold air to enter the chamber c without passing through the heating-tubes d.

The combination, wi th a combustion-cham- Soi,

ber, of a cold-air-inlet pipe provided with a Valve outside the combustion-chambelg a cold-air pipe connected directly with said inlet-pipe, a cold-air receiver arranged inside the combustion-chamber and connected to said cold-air pi'pe,a second cold-air pipe provided with a valve outside the combustion-chamber, a distributing-chamber provided with a series of perforations and directly connected with said second inlet-pipe, and a series of pipes freely exposed to the burning gas in the combustion-chamber and connecting the cold-air receiver with the said distributing-chamber at a point intermediate between the second cold-air inlet and the said series of perforations, substantially as and for the purpose set forth.

JOHN FRODSOM. I ANDREV MCLINDEN.

Witnesses:

WM. HoBsoN, EDWD. TYsoN. 

